We can not change the fact
that OEM gears, if run "backwards", are inherently weaker and it doesn't matter if they are old or "fresh" from the cutter. Geometry was and still will be wrong for the application (the tooth flanks incline angle is wrong and promotes over-stress fractures).
Why waste money on making duplicates of the original inferior CWP? They still won't be "right", (still working on wrong side of the teeth,coast side is used as a drive side, which contributes to the fatigue failures).
In contrast, the new parts can be designed to withstand hi torque and internal impact, AND should be reverse-cut to allow correct gear meshing. Let's not discount the 9/35 ratio benefits, which make car more responsive and faster.
So..., clearly, we're comparing apples to oranges.
Oh, and hartelijk dank for giving me your approval to go ahead.
Additional strength can be achieved by Deep Cryogenic treatment.
Cryogenic treatment, can effectively increase gear box (or any other component) strength and durability. Actually any part can be treated, camshafts, diff carriers, heads, pistons, con rods, etc.
Cryo-service companies are more and more common and getting less expensive every day. For example in US one can get crank shaft treated for under $150 !
Cryogenic treatment, also known as cryogenic tempering or freezing, utilizes ultra-cold temperatures (-301 to - 317F) to modify the micro-structure of metals and other materials.
Cryogenic treatment promotes additional crystalline transformations in metals. Deep cryogenic freezing ultimately improves the performance of the metal parts. Improvement in durability is around 100 percent (that's double !!!). The typical increase in strength is 30 to 50 percent. As you might imagine, these results can dramatically reduce broken part expenditures.